[2] The hospital was pioneered by American physician Dr. Eugene Stafford on February 3, 1902 as an eight-bed sanatorium at the area where the present-day Baguio office of Commission of Elections stands.

[9] On October 3, 2018, President of the Philippines Rodrigo Duterte signed into law Republic Act 11084 which increased the bed capacity of BGHMC from 500 to 800.

[10][11] Baguio Representative Mark Go filed House Bill 8782 on February 20, 2021, which would allow BGHMC to further increase its bed capacity from 800 to 1500 which got signed into law on June 29, 2022, as Republic Act 11889.

Alongside the new structures is the expansion and renovation of the Infectious Disease building which would host a Polymerase chain reaction (PCR) laboratory and isolation rooms for MERS COV patients and the completion of the out-patient drug treatment and rehabilitation unit.

[13][14][15][16] In July 2024, Mayor Benjamin Magalong asked Secretary Teodoro Herbosa to inquire into BGHMC's sub-standard Trauma Center, Outpatient Department and Flavier buildings.